Sun International review: Slot machine rigged Meropa Sun

I played one of the slot machines last night alongside the wall at the back in the smoking casino. It's one of these games where when the pot's full it opens a screen and you choose disks to reveal whether you've won the Mini; Major or Grand Jackpots. On two occasions at least that I recall when touching a square it automatically defaults to a one that you didn't touch, in other words a lower amount like Mini Jackpot. I had two for Grand Jackpot and it wouldn't open up the third disk I touched. Automatically defaulted to Mini Jackpot. You want to tell there's not something going on there...?